Added library code for generating unique autoincremented filenames.
Finessed drive-import logic to ensure drives are imported with unique names (rather than refusing to import to avoid name collisions, as was the case before). Tentative code modernisation of BXDriveImport API.
Made BXDrive trim off autoincremented filename suffixes when parsing volume labels from filenames.
Fixed idiot bug from ADBToolkit modernisation.
Fixed order of incremented unique filename formats.
Made drive import naming more conscientious, to avoid e.g. duplicate drive letter prefixes when importing previously-imported images/folders.
Eliminated BXDOSFilesystem's CD audio volume check, and the resulting dependence on NSWorkspace.
Store DOS volume label separately on BXDrive, to avoid yucky DOSified volume labels from sneaking into import names and UI.